Chemical Kinetics PYQs - Last 5 Years
MHT CET / Chemistry / Physical Chemistry / 177 recent questions
ChemistryPhysical Chemistry2022-2026
Practice 177 MHT CET Chemistry questions from Chemical Kinetics. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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Last 5 Years Chemical Kinetics Questions
Showing 27 of 177 filtered questions.
1Chemical Kinetics
Calculate the rate constant of the first order reaction if \(80 \%\) of the reactant decomposes in 60 minutes.
MCQ+1 / -02023
2Chemical Kinetics
Which from following is the slope of the graph of \([\mathrm{A}]_{\mathrm{t}}\) versus time for zero order reaction?
MCQ+1 / -02023
3Chemical Kinetics
Calculate the rate constant of the first order reaction if \(20 \%\) of the reactant decomposes in 15 minutes.
MCQ+1 / -02023
4Chemical Kinetics
Find the rate of formation of \(\mathrm{NO}_{2(\mathrm{~g})}\) in the following reaction.
$$\begin{aligned}
& 2 \mathrm{~N}_2 \mathrm{O}_{5(\mathrm{~g})} \rightarrow 4 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \\
& {\left[\fr...
$$\begin{aligned}
& 2 \mathrm{~N}_2 \mathrm{O}_{5(\mathrm{~g})} \rightarrow 4 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \\
& {\left[\fr...
MCQ+1 / -02023
5Chemical Kinetics
For the reaction, \(2 A+2 B \longrightarrow 2 C+D\), the rate law is expressed as rate \(=k[A]^2[B]\).
Calculate the rate constant if rate of reaction is \(0.24 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}\).
[[\(A\)]\(=0.5 \mathrm{M}\)...
Calculate the rate constant if rate of reaction is \(0.24 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}\).
[[\(A\)]\(=0.5 \mathrm{M}\)...
MCQ+1 / -02023
6Chemical Kinetics
For the reaction,
\(\mathrm{CH}_3 \mathrm{Br}(a q)+\mathrm{OH}^{-}(a q) \longrightarrow \mathrm{CH}_3 \mathrm{OH}(a q)+\mathrm{Br}^{-}(a q),\)
The rate law is rate \(=k\left[\mathrm{CH}_3 \mathrm{Br}\right]\left[\mathrm{OH}^{-}\right]\). W...
\(\mathrm{CH}_3 \mathrm{Br}(a q)+\mathrm{OH}^{-}(a q) \longrightarrow \mathrm{CH}_3 \mathrm{OH}(a q)+\mathrm{Br}^{-}(a q),\)
The rate law is rate \(=k\left[\mathrm{CH}_3 \mathrm{Br}\right]\left[\mathrm{OH}^{-}\right]\). W...
MCQ+1 / -02023
7Chemical Kinetics
Which from following statements about rate constant is NOT true?
MCQ+1 / -02023
8Chemical Kinetics
Identify rate law expression for \(2 \mathrm{NO}_{(\mathrm{g})}+\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{NOCl}_{(\mathrm{g})}\) if the reaction is second order in \(\mathrm{NO}\) and first order in \(\mathrm{Cl}_2\).
MCQ+1 / -02023
9Chemical Kinetics
Calculate the rate constant of first order reaction if half life of reaction is 40 minutes.
MCQ+1 / -02023
10Chemical Kinetics
Calculate the time needed for reactant to decompose \(99.9 \%\) if rate constant of first order reaction is 0.576 minute\(^{-1}\).
MCQ+1 / -02023
11Chemical Kinetics
The rate law for the reaction \(\mathrm{A}+\mathrm{B} \rightarrow \mathrm{C}\) at \(25^{\circ} \mathrm{C}\) is given by rate \(=k[A][B]^2\). Calculate the rate of reaction if rate constant at same temperature is $$6.25 \mathrm{~mol}^{-2} \m...
MCQ+1 / -02023
12Chemical Kinetics
A first order reaction takes 23.03 minutes for \(20 \%\) decomposition. Calculate its rate constant.
MCQ+1 / -02023
13Chemical Kinetics
What is half life time of a first order reaction if initial conc. of reactant is \(0.01 \mathrm{~mol} \mathrm{~L}^{-1}\) and rate of reaction is \(0.00352 \mathrm{~mol} \mathrm{~L}^{-1}\) minute \(^{-1}\) ?
MCQ+1 / -02023
14Chemical Kinetics
Slope of the graph between \(\log \frac{[\mathrm{A}]_0}{[\mathrm{~A}]_{\mathrm{t}}}\) (y axis) and time ( \(x\) axis) for first order reaction is equal to:
MCQ+1 / -02023
15Chemical Kinetics
For an elementary reaction
\(2 \mathrm{~A}+\mathrm{B} \longrightarrow 3 \mathrm{C}\)
rate of appearance of \(\mathrm{C}\) is \(1.3 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\), the rate of disappearance of \(\mathrm{A}\)...
\(2 \mathrm{~A}+\mathrm{B} \longrightarrow 3 \mathrm{C}\)
rate of appearance of \(\mathrm{C}\) is \(1.3 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\), the rate of disappearance of \(\mathrm{A}\)...
MCQ+1 / -02023
16Chemical Kinetics
Identify the expression for average rate for following reaction.
\(\mathrm{N}_{2(\mathrm{~g})}+3 \mathrm{H}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{NH}_{3(\mathrm{~g})}\)
\(\mathrm{N}_{2(\mathrm{~g})}+3 \mathrm{H}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{NH}_{3(\mathrm{~g})}\)
MCQ+1 / -02023
17Chemical Kinetics
Calculate the rate constant of the first order reaction if \(80 \%\) of the reactant reacted in 15 minute.
MCQ+1 / -02023
18Chemical Kinetics
For a reaction \(\mathrm{A}+\mathrm{B} \rightarrow\) product, if \([\mathrm{A}]\) is doubled keeping \([\mathrm{B}]\) constant, the rate of reaction doubles. Calculate the order of reaction with respect to A.
MCQ+1 / -02023
19Chemical Kinetics
The reaction, \(3 \mathrm{ClO}^{-} \rightarrow \mathrm{ClO}_3^{-}+2 \mathrm{Cl}^{-}\) occurs in two steps:
i. \(\quad 2 \mathrm{ClO}^{-} \rightarrow \mathrm{ClO}_2^{-}+\mathrm{Cl}^{-}\)
ii. $$\quad \mathrm{ClO}_2^{-}+\mathrm{ClO}^{-} \right...
i. \(\quad 2 \mathrm{ClO}^{-} \rightarrow \mathrm{ClO}_2^{-}+\mathrm{Cl}^{-}\)
ii. $$\quad \mathrm{ClO}_2^{-}+\mathrm{ClO}^{-} \right...
MCQ+1 / -02023
20Chemical Kinetics
What is the half life of a first order reaction if rate constant is \(4.2 \times 10^{-2}\) per day?
MCQ+1 / -02023
21Chemical Kinetics
For the reaction, \(3 \mathrm{~I}+\mathrm{S}_2 \mathrm{O}_8^{2-} \rightarrow \mathrm{I}_3^{-}+2 \mathrm{SO}_4^{2-}\), at a particular time \(\mathrm{t}, \frac{\mathrm{d}\left[\mathrm{SO}_4^{2-}\right]}{\mathrm{dt}}\) is $$2.2 \times 10^{-2}...
MCQ+1 / -02023
22Chemical Kinetics
Time required for \(90 \%\) completion of a first order reaction is '\(x\)' minute. Calculate the time required to complete \(99.9 \%\) of the reaction at same temperature.
MCQ+1 / -02023
23Chemical Kinetics
Calculate the rate constant for the first order reaction, \(\mathrm{A} \rightarrow \mathrm{B}\) if the rate of reaction is \(5.4 \times 10^{-6} \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}\) and \([\mathrm{A}]=0.3 \mathrm{M}\).
MCQ+1 / -02023
24Chemical Kinetics
Find the average rate of formation of \(\mathrm{NO}_{2(\mathrm{~g})}\), in following reaction.
$$\begin{aligned}
& 2 \mathrm{~N}_2 \mathrm{O}_{5(\mathrm{~g})} \rightarrow 4 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \\
& {\lef...
$$\begin{aligned}
& 2 \mathrm{~N}_2 \mathrm{O}_{5(\mathrm{~g})} \rightarrow 4 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \\
& {\lef...
MCQ+1 / -02023
25Chemical Kinetics
If rate of reaction is given as
\(\frac{1}{3} \frac{\mathrm{d}[\mathrm{x}]}{\mathrm{dt}}=-\frac{1}{2} \frac{\mathrm{d}[\mathrm{y}]}{\mathrm{dt}}=-\frac{\mathrm{d}[\mathrm{Z}]}{\mathrm{dt}}\),
the reaction can be represented as
\(\frac{1}{3} \frac{\mathrm{d}[\mathrm{x}]}{\mathrm{dt}}=-\frac{1}{2} \frac{\mathrm{d}[\mathrm{y}]}{\mathrm{dt}}=-\frac{\mathrm{d}[\mathrm{Z}]}{\mathrm{dt}}\),
the reaction can be represented as
MCQ+1 / -02022
26Chemical Kinetics
Find the rate constant of first order reaction in second having half life of 2.5 hours.
MCQ+1 / -02022
27Chemical Kinetics
For the reaction \(\mathrm{N}_{2(\mathrm{~g})}+3 \mathrm{H}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{NH}_{3(\mathrm{~g})}\), rate of disappearance of \(\mathrm{N}_{2(\mathrm{~g})}\) is \(2.22 \times 10^{-3} \mathrm{~mol} \mathrm{~dm}^{-3}\). ...
MCQ+1 / -02022